Azo dye.



UNITED STATES PriTlENT OFFICE.

FRIEDRICH RUNKEL AND MARTIN HERZBERG, OF ELBERFELD, GERMANY, ASSIGNORS TO FARBENFABRIKEN VORM. FRIEDR. BAYER & (30., OF ELBERFELD, GERMANY,

A CORPORATION OF GERMANY.

AZO DYE.

No Drawing.

To (all whom it may concern:

Be it known that we, Fnmnmcii Runner. and MARTIN I'IERZBERG, doctors of philosophy, chemists, citizens of the German Eur pire, residing at Elberteld, Germany, have invented new and useful Improvements in New Azo Dyes, of which the following is a specification.

In our application of the same date Serial No. 508.985, we have described a class of am colors obtainable from halogen substituted derivatives of amiuophenylethers, periaminonaphthol sulfonic acid and any other diazo compound.

This application relates specifically to the manufacture and production of a new am dye which can be obtained by combining the one molecule of the d'iazo compound of ortho-amin0-para-chloro-phei'iylether with one molecule of l.8aminonaphthol3.(S-disul'tonic acid.

In order to illustrate the new process more fully the following example is given, the parts being by weight. 16.2 parts of 2.5-dichloroanilin are dissolved in 160 parts of hot water and 160 parts of hot crude hydrot Aftervit has been rendered alkaline Specification of Letters Patent.

Application filed July 22, 1909. Serial No. 508,984.

'latented Feb. 1910.

are added. After some time the precipitated dye is filtered oll'. redissolved from hot water, filtered olt', pressed and dried. It i after being dried and pulverized in the shape of its sodium salt a dark powder soluble in water with a dark blue color and soluble in cmu-entrated sulfuric acid with a dark green color.

Upon reduction with stannous chlorid and hydrochloric acid the new dye is decomposed, ij-dichloroanilin. orthoaniinc-para-chloroplusnvlether and l.2.T-trianiino-S-naphthol- 3.ti-disuIfonic acid are obtained. The new dyestult' dyes wool blue-black shades fast to washing and to milling.

\Ve claim:

The herein described new dia'/.o dyestull' obtainable from diazotized dichloroanilin,

ttln't' and l.8-aminona )hthol-3.ti-disultonie acid, which dye is after being, dried and pulverixed in the shape of its sodium salt a dark powder soluble in water with a dark blue color and soluble in concentrated sultonic acid with a dark green color; fielding upon reduction with stannous ehlorid and hydrochloric acid dichloroanilin, ortho-an'iino para chloro phenylether and 1.2.7 triamino S-naphthol-Sll-disnl'tonic acid: and d ving wool blue-black shades remarkable for their tastncss to washing and to n'iilling,

I substantially as described.

In testimony whereo't we have hereunto set our hands in the presence ot two SIIbSCIIlHHg \\'lllltfi$(.

FRIEDRICH RUNKEL. ['L. sl] MARTIN HERZBERG. [us] lVitnesses O'r'ro Kerrie, W ILLY Kin-11x.

It is hereby certified that in Letters Patent No. 950,405, granted February 22,

l 1910, upon the application of Friedrich ltunkel and Martin Herzberg, of Elbert'eld, Germany, for an improvement in Azo Dyes, errors appear in the printed specification requiring correction as follows: Line 55, the Word anirno should read (amino, and lines 68-69 the Word sulfonic should read sulfuric; and that the said 1 Letters Patent should be read With these corrections therein that the same may conform to the record of the case .in the Patent Ofiice.

Signed and sealed this 26th day of April, A. D., 1910.

[SEAL] C. C. BILLINGS,

Acting Oommssoneraf Patents. 

